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Loans - Credit risk profile by risk grade of acquired non-credit impaired loans (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019
--- | --- | ---
Loans |  |
Total loans | $ 11,375,104 | $ 11,290,147
Construction and land development |  |
Loans |  |
Total loans | 1,017,261 | 1,025,387
Other income producing property |  |
Loans |  |
Total loans | 346,554 | 361,879
Consumer Owner Occupied Loans |  |
Loans |  |
Total loans | 2,706,960 | 2,760,126
Other loans |  |
Loans |  |
Total loans | 13,892 | 1,457
Commercial loans | Commercial non-owner occupied |  |
Loans |  |
Total loans | 2,323,967 | 2,357,730
Commercial loans | Commercial and industrial |  |
Loans |  |
Total loans | 1,386,327 | 1,261,527
Consumer | Home equity loans |  |
Loans |  |
Total loans | 758,020 | 773,363
Consumer | Consumer |  |
Loans |  |
Total loans | 663,422 | 654,883
Acquired non-credit impaired loans |  |
Loans |  |
Total loans | 1,760,427 | 1,965,603
Acquired non-credit impaired loans | Pass |  |
Loans |  |
Total loans | 1,697,942 | 1,897,922
Acquired non-credit impaired loans | Special mention |  |
Loans |  |
Total loans | 39,772 | 31,970
Acquired non-credit impaired loans | Substandard |  |
Loans |  |
Total loans | 22,713 | 35,711
Acquired non-credit impaired loans | Construction and land development |  |
Loans |  |
Total loans |  | 53,302
Acquired non-credit impaired loans | Commercial non-owner occupied |  |
Loans |  |
Total loans |  | 503,443
Acquired non-credit impaired loans | Commercial owner occupied real estate loan |  |
Loans |  |
Total loans |  | 345,040
Acquired non-credit impaired loans | Commercial and industrial |  |
Loans |  |
Total loans |  | 126,092
Acquired non-credit impaired loans | Other income producing property |  |
Loans |  |
Total loans | 95,697 | 103,093
Acquired non-credit impaired loans | Consumer Owner Occupied Loans |  |
Loans |  |
Total loans |  | 543,432
Acquired non-credit impaired loans | Home equity loans |  |
Loans |  |
Total loans |  | 198,112
Acquired non-credit impaired loans | Consumer |  |
Loans |  |
Total loans |  | 93,089
Acquired non-credit impaired loans | Commercial loans |  |
Loans |  |
Total loans | 985,780 | 1,130,970
Acquired non-credit impaired loans | Commercial loans | Pass |  |
Loans |  |
Total loans | 950,062 | 1,090,140
Acquired non-credit impaired loans | Commercial loans | Special mention |  |
Loans |  |
Total loans | 27,005 | 19,186
Acquired non-credit impaired loans | Commercial loans | Substandard |  |
Loans |  |
Total loans | 8,713 | 21,644
Acquired non-credit impaired loans | Commercial loans | Construction and land development |  |
Loans |  |
Total loans | 33,569 | 53,302
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Pass |  |
Loans |  |
Total loans | 31,690 | 51,340
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Special mention |  |
Loans |  |
Total loans | 966 | 736
Acquired non-credit impaired loans | Commercial loans | Construction and land development | Substandard |  |
Loans |  |
Total loans | 913 | 1,226
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied |  |
Loans |  |
Total loans | 447,441 | 503,443
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Pass |  |
Loans |  |
Total loans | 432,710 | 492,258
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Special mention |  |
Loans |  |
Total loans | 14,162 | 5,035
Acquired non-credit impaired loans | Commercial loans | Commercial non-owner occupied | Substandard |  |
Loans |  |
Total loans | 569 | 6,150
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan |  |
Loans |  |
Total loans | 307,193 | 345,040
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Pass |  |
Loans |  |
Total loans | 300,678 | 330,005
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Special mention |  |
Loans |  |
Total loans | 3,092 | 3,427
Acquired non-credit impaired loans | Commercial loans | Commercial owner occupied real estate loan | Substandard |  |
Loans |  |
Total loans | 3,423 | 11,608
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial |  |
Loans |  |
Total loans | 101,880 | 126,092
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Pass |  |
Loans |  |
Total loans | 97,092 | 120,926
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Special mention |  |
Loans |  |
Total loans | 2,948 | 4,051
Acquired non-credit impaired loans | Commercial loans | Commercial and industrial | Substandard |  |
Loans |  |
Total loans | 1,840 | 1,115
Acquired non-credit impaired loans | Commercial loans | Other income producing property |  |
Loans |  |
Total loans | 95,697 | 103,093
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Pass |  |
Loans |  |
Total loans | 87,892 | 95,611
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Special mention |  |
Loans |  |
Total loans | 5,837 | 5,937
Acquired non-credit impaired loans | Commercial loans | Other income producing property | Substandard |  |
Loans |  |
Total loans | 1,968 | 1,545
Acquired non-credit impaired loans | Consumer |  |
Loans |  |
Total loans | 774,647 | 834,633
Acquired non-credit impaired loans | Consumer | Pass |  |
Loans |  |
Total loans | 747,880 | 807,782
Acquired non-credit impaired loans | Consumer | Special mention |  |
Loans |  |
Total loans | 12,767 | 12,784
Acquired non-credit impaired loans | Consumer | Substandard |  |
Loans |  |
Total loans | 14,000 | 14,067
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans |  |
Loans |  |
Total loans | 496,431 | 543,432
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Pass |  |
Loans |  |
Total loans | 486,433 | 532,760
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Special mention |  |
Loans |  |
Total loans | 6,434 | 6,805
Acquired non-credit impaired loans | Consumer | Consumer Owner Occupied Loans | Substandard |  |
Loans |  |
Total loans | 3,564 | 3,867
Acquired non-credit impaired loans | Consumer | Home equity loans |  |
Loans |  |
Total loans | 188,732 | 198,112
Acquired non-credit impaired loans | Consumer | Home equity loans | Pass |  |
Loans |  |
Total loans | 174,912 | 184,946
Acquired non-credit impaired loans | Consumer | Home equity loans | Special mention |  |
Loans |  |
Total loans | 5,679 | 5,405
Acquired non-credit impaired loans | Consumer | Home equity loans | Substandard |  |
Loans |  |
Total loans | 8,141 | 7,761
Acquired non-credit impaired loans | Consumer | Consumer |  |
Loans |  |
Total loans | 89,484 | 93,089
Acquired non-credit impaired loans | Consumer | Consumer | Pass |  |
Loans |  |
Total loans | 86,535 | 90,076
Acquired non-credit impaired loans | Consumer | Consumer | Special mention |  |
Loans |  |
Total loans | 654 | 574
Acquired non-credit impaired loans | Consumer | Consumer | Substandard |  |
Loans |  |
Total loans | $ 2,295 | $ 2,439

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